1 88 Johnson. — On the Nursing of the Embryo 
protected by a well-developed cuticle, which is raised into 
numberless small undulating parallel ridges running length- 
wise, more developed towards the tip of the hair, which is 
slightly bent and enlarged, and shows beneath the cuticle a 
thick stratified layer which looked like, but did not give, the 
reactions of viscid matter (Fig. io). All the following re- 
actions were obtained on setae of ripe fruits : — 
1. A seta was examined in pure glycerine and measured 
at its tip. The glycerine was removed and water run in. 
The hairs, collapsed by the removal of the cell-sap, by being 
placed in spirit, filled out to a certain extent through the 
entrance of water, but there was no swelling of the substance 
of the hair. Two setae were taken from the same fruit, one 
placed in pure glycerine, the other in water for a day and 
night ; there was no appreciable difference in the hairs of the 
two on examination. 
2. Corallin-soda solution had no effect after twenty-four 
hours immersion of seta. 
3. Methylene-blue, 50 per cent, spirit solution, for sixty 
hours had no effect on wall, stained the protoplasmic lining 
of the hairs. 
Hoffman’s blue had no effect. 
4. Caustic-potash solution — no effect, for some time. 
5. Iodine solution — tip of hair like its base orange-red, 
rest of hair yellowish-brown. 
6. Schulze’s solution — same as 5. 
7. Iodine solution and sulphuric acid — the hair yellowish- 
brown generally. 
8. Sulphuric acid— the hair, tip included, resisted the action 
of this reagent. 
Experiments 1-4 tend to prove that viscidity is absent 
from any part of seta or hairs ; 5-8 that the wall of the hair 
is formed externally of a thick cuticle, and that the tip of the 
hair has a thick cuticularised layer. 
The vascular system of the flower is very simple. A single 
vascular bundle enters each sessile flower and gives off three 
vascular bundles, one to each seta, and, at a little higher point, 
